YUI Library Examples: The YUI Global Object: Combine Data Sets with merge

<!-- include yui -->
<script type="text/javascript" src="../../build/yui/yui.js"></script>
 
YUI().use("node", "dump", function(Y) {
    // This method is in the core of the library, so we don't have to use() any
    // additional modules to access it.  However, this example requires 'node'.

var set1 = { foo : "foo" };
var set2 = { foo : "BAR", bar : "bar" };
var set3 = { foo : "FOO", baz : "BAZ" };
var result = Y.one('#demo_result');
 
var doMerge = function () {
 
    Y.log('set1 = ' + Y.dump(set1));
    Y.log('set2 = ' + Y.dump(set2));
    Y.log('set3 = ' + Y.dump(set3));
 
    Y.log('Merging set1, set2, and set3');
    var merged = Y.merge(set1, set2, set3);
    Y.log('merged = ' + Y.dump(merged));
 
    result.set('innerHTML', '<p>' + stringifyObj(merged) + '</p>');
};
 
Y.on('click', doMerge, '#demo_btn');
 

var doCopy = function () {
 
    // Create set4 with an object property 'obj'
    var set4 = {
        obj: {}
    };
 
    // Create a shallow copy of set4
    var copy = Y.merge(set4);
 
    // Add a property to the copy inside of the 'obj' property
    copy.obj.addedToCopy = true;
 
    Y.log('After modifying the copy: ');
 
    // The result object is not the same as the original, but
    var msg = ('"copy" should NOT be equal to the "original" (false expected): ' + (copy === set4));
 
    // objects in the result object will reference the same object in
    // the input object.
    msg += '<br />copy.obj.addedToCopy should be equal to original.obj.addedToCopy (true expected): ' + 
            (copy.obj.addedToCopy === set4.obj.addedToCopy);
 
    Y.log(msg);
    result.set('innerHTML', '<p>' + msg + '</p>');
};